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static inline uint8x16x4_t
enc_reshuffle (uint8x16x3_t in)
{
uint8x16x4_t out;
// Input:
// in[0] = a7 a6 a5 a4 a3 a2 a1 a0
// in[1] = b7 b6 b5 b4 b3 b2 b1 b0
// in[2] = c7 c6 c5 c4 c3 c2 c1 c0
// Output:
// out[0] = 00 00 a7 a6 a5 a4 a3 a2
// out[1] = 00 00 a1 a0 b7 b6 b5 b4
// out[2] = 00 00 b3 b2 b1 b0 c7 c6
// out[3] = 00 00 c5 c4 c3 c2 c1 c0
// Move the input bits to where they need to be in the outputs. Except
// for the first output, the high two bits are not cleared.
out.val[0] = vshrq_n_u8(in.val[0], 2);
out.val[1] = vshrq_n_u8(in.val[1], 4);
out.val[2] = vshrq_n_u8(in.val[2], 6);
out.val[1] = vsliq_n_u8(out.val[1], in.val[0], 4);
out.val[2] = vsliq_n_u8(out.val[2], in.val[1], 2);
// Clear the high two bits in the second, third and fourth output.
out.val[1] = vandq_u8(out.val[1], vdupq_n_u8(0x3F));
out.val[2] = vandq_u8(out.val[2], vdupq_n_u8(0x3F));
out.val[3] = vandq_u8(in.val[2], vdupq_n_u8(0x3F));
return out;
}
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